1、M42 to all For Canon mount adapter ring 2、Make M42 mount lenses (for Zeiss/Pentax/Praktica/Mamiya/Zenit) can be used on cameras 3、There is no ROM connection on the ring so diaphragm control of the lens is set manually 4、It is possible to use Macro rings and other accessories 5、Metal construction is solid and durable Description: M42 to all For Canon mount adapter ring Make M42 mount lenses (for Zeiss/Pentax/Praktica/Mamiya/Zenit) can be used on cameras There is no ROM connection on the ring so diaphragm control of the lens is set manually It is possible to use Macro rings and other accessories Metal construction is solid and durable Specification: Condition: 100% Brand New Material: Metal Color: Black Notice: Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter. In this case "stop-down mode" will need to be used when metering since the lens does not have the  ability to have its aperture controlled by the camera body. You can shoot with manual mode or  aperture priority mode Suitable For Compatible Lens: M42 Lens Compatible Camera Body: for Canon EOS Cameras Package Contains: 1 x Lens mount adapter (made of Metal)